The other day I needed to scan a range of IP addresses to find out which ones were actually in use, and I began looking for a tool that might make that task a little easier. I found some things that could be run through the command line/terminal, but I figured there had to be something that had a GUI. That’s when I stumbled across Angry IP Scanner.

This is a pretty simple app that lets you specify the IP range you want scanned (via start/end addresses or with a subnet mask), and then kick off the crawl. Once it’s done you’ll see a screen like the one above summarizing how many IPs responded and are therefore active.